/Engine/Plugins/Experimental/Mutable/Source/CustomizableObject/Classes/MuCO/CustomizableObjectInstance.h
Increases the range of values of the projector with ParamName, returns the index of the new projector value, -1 otherwise. The added value is initialized with the default projector as set up in the editor and is the last one of the range.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=CustomizableObjectInstance) int32 AddValueToProjectorRange ( const [FString](API\Runtime\Core\Containers\FString) & ParamName )